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Why chose OneStep Power?

We saw a problem, DP2 and DP3 dynamically positioned vessels were not running at peak efficiency.

Vessels run in open bus configuration for safety, but at a higher cost.

We can show you a better option!

For a quick overview of Open Bus vs. Closed Bus click here

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Open Bus Configuration

Most vessels run in open bus configuration for safety. In the diagram above, the generator banks are disconnected from each other, each requiring two generators to keep enough power and prevent an outage if one generator goes down. All generators are connected and running constantly, reducing efficiency and increasing operational expenses like fuel and maintenance. Increased fuel consumption increases emissions.

If vessels have not been properly tested to safely run in closed bus, open bus is the only option.

Closed Bus Configuration

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Closed bus connects banks safely. With the banks connected, generators can be disconnected safely, allowing the remaining generators to run at peak efficiency. Peak efficiency combined with running fewer generators at the same time reduces operating expenses by using less fuel, creating less wear and tear on the generators, and reducing emissions.

All vessels running in closed bus must be tested & verified to ensure safety.

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What are the benefits of running efficiently?

  • Up to 16% fuel savings: $200,000 to $2,500,000 per year

  • Reduced engine maintenance costs

  • Lower emissions

  • Enables propulsion flexibility (more info?)

How do you test for closed bus?

  1. Short Circuit Testing

  2. Generator Voltage Response Tester (GVRT)

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What's the difference?

Short circuit testing can verify your vessel for closed bus, but has some downsides. Short circuit testing uses high current, which can reduce equipment life. It only tests a single fault path, so multiple tests may be required depending on the need. It's also more time intensive than newer testing. In summary, it's a destructive test that takes more time than modern solutions.

The GVRT tests for open bus safety as well, but with no current spikes at all. It's 100% safe for all equipment and the only test to verify the entire system. It takes less time, typically a couple of days. It's proven safe technology.

If you're interested in testing your vessel for closed bus operation give us a call or send us a message via the form below. We test single vessels and have discounts for fleets.

Call or message us to start the conversation:

Telephone: +1.713.499.0498

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We will get back to you within 2 business days.

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